of pabis



'bolic acid and carbolic acid of anthracene, some of the impuritiesnnrrsn snares FATEECE HENRI LEBOUX, or PARIS, Ensues, assrenoa 'ro asocmrs wacna rnacn CHAUFFAGEET roncn Morales, S-IEGE SOCIAL, or rears,FRANCE. -v

IROCESS FOR THE PRODUCTION OE HIGH P ERCENTAGE CABBAZOLE No Drawing.

To all whom it may concern Be it known that I, HENRI 'LERoUX, c.1t1-

zen of the Republic of France, and resident of Paris, France,(post-office address Rue Maria-Deraimes,) have invented a new and usefulProcess for the Production of High- Percentage Carbazole, whichimprovements are fully set forth in the following specification.

This invention relates to a process for the production of purecarbazole.

The solubility of anthracene and of oarbazole in most solvents being, atordinary temperature, approximately the same, the methodsused inpractice for concentrating anthracenelead to a product which also isricher in carbazole. All the same the use of pyridine gives a morecomplete purification of the anthracene; and in addition gives a pyridinliquor which is very-rich in carbazole, containing apart from a smallamount present in the crude product.

Accordin zole is disso ved in the warm in phenol (including phenol,crude phenol or crude car- 5 strength), cresols (including ortho-cresol,

tri-cresol, z. e., a mixture of meta-, orthoand para-cresol and(including meta-para-cresol, e., a mixture of metaand para-cresolsg,xylenols and the like homologues of phenol either used alone or inadmixture with each other. The carbazole is then crystallized out, andthe crystals separated from the mother liquor and washed by means ofcresols or the like homologues of phenol or in mixtures of such phenols.

The pyridin liquors resulting from the purification of anthracenefurnish after distilling off the yridin a residue which when treatedwith p enolic products yields a product containing carbazole.

EwampZe 1.

1 kilo of pyradin residue resulting from the purification of anthraceneis dissolved in the warm in 5 kilos of a mixture of cresols andxylenols. After cooling, the crystals are separated, and washed with asmall amount of said mixture of cresols and Xylenols these latter beingthen removed by any suitable known means. In this Way an 80% carbazoleis obtained.

Specification of Letters Patent.

compounds.

What I claim as new and desire to secure to the invention, crudelcarba-Patented (Pet, '8,

Application filed October 31, 191s. Serial No. 260.472.

The 80% carbazole when submitted to a I new crystalization gives a 90%product.

E ammpic 2. 1 kilo of 80% carbazole or the equivalent amount obtainedfrom the previous treat ment and still containing the phenolic compoundsused for Washing, is dissolved in '10 kilos of cresols and xylenols. Thesolution is filtered while hot (50 C) and the crystals are washed with asmall amount of cresols and Xylenols. After removing till the phenoliccompounds, as before mentioned, a

90% carbazole is obtained. r v

The crude carbazole recovered from potassium carbazole which latter isobtained by the action of caustic potash on crude or con- 1 centratedanthracene leads also to a 90% carbazole after crystalization fromphenolic by Letters Patent of the UnitedStates is v1.;The process forthe production otcarbazole fwhich consists in dissolving crude carbazolein a phenolic compound, ,crystallizing out the carloazole and separatingthe crystals from the mother liquor. 1.

2. ,The process for the production of carbazole which consists indissolving in the -warm crude carbazole in a phenolic com a phenoliccompound, filtering the solution while hot, crystallizing out thecarbazole, separating the crystals from the mother liquor, washing thecarbazole crystals with a small amount of phenolic compounds andremoving the washing liquids.

4. The process for the production of carbazole which consists indissolving in the .warm the residue, obtained by distilling the pyridinliquor from the process of concentrating anthracene, in a phenoliccompound, cooling the solution, crystallizing out the carmother liquor,

bazole, separating the crystals" from the washing the carbazole crystalswith phenolic compounds andremoving the washing liquidsg.

5. The process for the production of carbazole which consists indissolving in the warm the residue, obtained byxlistilling the pyridinliquor from the process of concentratin anthracene, in. a phenoliccompound, crysta izing out the carbazole,separat1ng'the crystals fromthe mother liquor, washing the carbazole crystals with phenoliccompounds,

dissolving said crystals in a phenolic com pound, filtering the solutionwhile hot, crystalhzing out the ca'rbazole, separating the crystals fromthe mother liquor, washing the carbazole crystals with a small amount ofin%' liquids.

specification 1n the presence of two sub-;

scribing witnesses.

Witnesses 'JU'LEs TOUSSET 1 CHARLES LrioN LoIsEL.

HENRI LEROU X.

v phenolic compounds and removing the-wash-

